drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Umgehung von Rechteprüfungen in Shorewall
Name: |
Umgehung von Rechteprüfungen in Shorewall |
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ID: |
200507-20:02 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
Sa, 17. September 2005, 14:37 |
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Referenzen: |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2317
http://www.shorewall.net/News.htm#20050717 |
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Applikationen: |
Shoreline Firewall |
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Originalnachricht |
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory [ERRATA UPDATE] GLSA 200507-20:02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Low Title: Shorewall: Security policy bypass Date: July 22, 2005 Updated: September 14, 2005 Bugs: #99398 ID: 200507-20:02
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Errata ======
The "unaffected" version was incorrectly set to 2.4.1 in the initial advisory, the correct "unaffected" version is 2.4.2.
The corrected sections appear below.
Synopsis ========
A vulnerability in Shorewall allows clients authenticated by MAC address filtering to bypass all other security rules.
Background ==========
Shorewall is a high level tool for configuring Netfilter, the firewall facility included in the Linux Kernel.
Affected packages =================
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-firewall/shorewall <= 2.4.1 >= 2.4.2
Description ===========
Shorewall fails to enforce security policies if configured with "MACLIST_DISPOSITION" set to "ACCEPT" or "MACLIST_TTL" set to a value greater or equal to 0.
Impact ======
A client authenticated by MAC address filtering could bypass all security policies, possibly allowing him to gain access to restricted services. The default installation has MACLIST_DISPOSITION=REJECT and MACLIST_TTL=(blank) (equivalent to 0). This can be checked by looking at the settings in /etc/shorewall/shorewall.conf
Workaround ==========
Set "MACLIST_TTL" to "0" and "MACLIST_DISPOSITION" to "REJECT" in the Shorewall configuration file (usually /etc/shorewall/shorewall.conf).
Resolution ==========
All Shorewall users should upgrade to the latest available version:
# emerge --sync # emerge --ask --oneshot --verbose net-firewall/shorewall
References ==========
[ 1 ] CAN-2005-2317 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2317 [ 2 ] Shorewall Announcement http://www.shorewall.net/News.htm#20050717
Availability ============
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200507-20.xml
Concerns? =========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
License =======
Copyright 2005 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
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